PVDS

The PVDS table is used to define the properties of a solvent for a range of different temperature and pressures. See example below, where data is given for only one temperature:

PVDS
  DATA_UNITS
    PRESSURE Bar
    FVF m^3/m^3
    VISCOSITY cP
  END
  DATA
    TEMPERATURE 15.0
      1.013529   0.9357635 0.0080
      18.250422  0.0678972 0.0096
      35.487314  0.0352259 0.0112
      69.961099  0.0179498 0.0140
      138.908669 0.0090619 0.0189
      173.382454 0.0072653 0.0208
      200.00     0.0063404 0.0223
      207.856239 0.0060674 0.0228
      276.803809 0.0045534 0.0268
      345.751379 0.0036439 0.0309
      621.541659 0.0021672 0.0470
    END !end TEMP block
  END !end DATA
END !end PVDS

The PVDS data may contain several different pressure tables, one for each temperature. In the pressure table, column 1 is the pressure, column 2 is the solvent formation volume factor (\(B_v\)), column 3 is the solvent viscosity (\(\mu_g\)).

The pressure in column 1 must increase monotonically, and the pressure tables must be ordered for increasing temperatures. The number of pressure points given for each temperature must be the same, however the values and range of the pressure can vary. Temperature and pressure outside the given range are extrapolated. When pressure data are available for only one temperature, the properties are considered isothermal.

The default units used by this table are:

• Bar for the pressure,

• \(m^3/m^3\) for \(B_s\)

• \(cP\) (centipoise) for the viscosity

• C for temperature.

DATA_UNITS specifies units different than the default values, and include only the properties (in any order) for which units are needed. The temperatures can currently be entered only in degree Celsius.